chore: add anonymizer skill publication artifacts

[binaryaaron]

Related Issue

No linked issue required: maintainer-owned NVSkills publication preparation.

Plan Document

No plan document required: this ports the landed Safe-Synthesizer NVSkills publication pattern to the existing Anonymizer skill package.

Summary

• Add the Anonymizer NVSkills skill card, benchmark scaffold, and six-case evaluation dataset.
• Make copied skill installs portable with published documentation fallbacks.
• Point fallbacks at the deployed /dev/ docs and include the evaluation guide added in docs: add docs for anonymizer replace evaluation #181.
• Move the interactive workflow into references/, add structural tests, and make the README agent-neutral.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring
• CI, release, or contributor workflow update

Contributor Checklist

• PR title follows Conventional Commits, for example fix: handle empty entity list
• Related issue is linked, or a maintainer-owned no-issue reason is documented above
• For non-trivial changes, a plan document is linked above, or the no-plan reason is documented above
• Public API impact checked; skills/anonymizer/SKILL.md updated if needed
• No real PII added to tests, docs, notebooks, fixtures, or artifacts
• No API keys, service tokens, private keys, credentials, or real endpoint secrets added

Validation

• Commands run:
  • uv run pytest tests/skills/test_anonymizer_skill.py -q
  • uv run --with pyyaml python /root/.codex/skills/.system/skill-creator/scripts/quick_validate.py skills/anonymizer
  • uv run pre-commit run check-json --files skills/anonymizer/evals/evals.json
  • make check
  • make docs-build
  • Verified that all six published /dev/ fallback URLs return HTTP 200.
• Skipped checks or known failures:
  • /nvskills-ci, measured benchmark results, and signing require the external NVSkills publication environment.
  • make check passes; its advisory typecheck continues to report existing repository diagnostics.

Documentation and Artifacts

• Docs updated, or not needed
• If docs changed: make docs-build passes locally
• If tutorial sources changed: notebooks regenerated with make convert-notebooks
• If e2e, benchmark, or model-provider behavior changed: relevant validation is listed above